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Custody in Divorce vs Parentage Cases: What Illinois Parents Need to Know

Jul 2, 2026 | Video Transcripts

When families in Chicago face the difficult reality of a custody dispute, one of the most common misconceptions is that the legal process works very differently depending on whether the parents were ever married. In Illinois, the truth is that the law treats both situations with the same fundamental framework. Whether you are going through a divorce or a parentage case, the courts apply the same standards and the same guiding principle: the best interest of the child. At KHK Family Law & Divorce Attorneys, we help both married and unmarried parents understand their rights and navigate the legal process with confidence.

The Best Interest of the Child Standard

Illinois law outlines more than a dozen factors that a judge must consider when determining custody, whether the parents were married or not. These factors include the physical and mental health of all parties, the child’s relationship with each parent, the child’s school and community ties, proximity to other relatives and important individuals in the child’s life, and the child’s own preferences. At KHK Family Law & Divorce Attorneys, Attorney Matthew Katz brings over 20 years of family law experience and a Master’s in Social Work from the University of Chicago to analyze each of these factors and build the strongest possible case for your child’s wellbeing.

Whether a couple was married for ten years or never married at all, a judge sitting in a Cook County courtroom will ask the same core question: what arrangement will best serve this child’s physical, emotional, and developmental needs?

How Divorce Cases Handle Custody

In a divorce proceeding, custody of children born during the marriage is addressed alongside property division, spousal support, and other issues. A child born to a married couple is presumed by law to be a child of the marriage, which means both parents automatically have standing to request parenting time and parental responsibility. The process moves forward through negotiation, mediation, or, when necessary, litigation before a judge. Our team at KHK Family Law & Divorce Attorneys has 70+ years of combined family law experience and is prepared to advocate for you at every stage.

How Parentage Cases Handle Custody

Parentage cases arise when parents were never married to each other. The good news is that Illinois law gives unmarried parents essentially the same rights as divorcing parents once parentage is established. The same best-interest factors apply, the same court processes are used, and the same range of custody outcomes is possible, from shared parenting arrangements to one parent having primary responsibility.

The key difference is that for unmarried fathers, parentage must first be legally established. This can happen in two ways. The first is through a Voluntary Acknowledgment of Paternity, or VAP, which is a document signed at the time of the child’s birth and filed with the Illinois Department of Children and Family Services. The second is through a court-ordered DNA test. Until paternity is established, an unmarried father does not yet have standing to request parenting time or custody. Once it is confirmed, however, that parent has the full right to pursue any custody arrangement, including full custody. Our attorneys at KHK Family Law & Divorce Attorneys help unmarried parents understand and move through this process efficiently.

Parenting Time vs Parental Responsibility

Illinois law distinguishes between two concepts that are often confused. Parenting time refers to the actual schedule of when each parent spends time with the child. Parental responsibility refers to the right and obligation to make significant decisions on behalf of the child, such as those related to education, healthcare, and religious upbringing. Both divorce and parentage cases must address both of these issues. At KHK Family Law & Divorce Attorneys, several of our staff members are fluent in both English and Spanish, ensuring that every family we serve fully understands these distinctions and their implications.

When a Parent Has Not Been Involved

One scenario that comes up in parentage cases is a biological father who was not present during the early years of the child’s life and now wants to establish a relationship. Illinois law allows for this, but the process requires establishing paternity first, then petitioning the court for parenting time. Courts will again look to the best interest of the child when determining whether and how much contact is appropriate, taking into account any history of the parent’s involvement, the child’s established routines, and the potential impact on the child’s stability.

The Role of Legal Representation

Whether your case involves a divorce with children or a parentage dispute, having skilled legal representation is essential. Courts make life-altering decisions about where children live, who makes decisions for them, and how much time they spend with each parent. These decisions deserve thoughtful, experienced advocacy. At KHK Family Law & Divorce Attorneys, Attorney Matthew Katz’s unique combination of legal training and a Master’s in Social Work from the University of Chicago gives our team a deep understanding of both the law and the human dynamics that shape family cases.

Conclusion

If you are facing a custody dispute in Chicago, whether you were married to the other parent or not, the path forward begins with understanding your rights. Illinois law provides a clear framework for both divorce and parentage cases, and the outcome in either is guided by the same core commitment to the child’s best interest. The sooner you engage qualified legal counsel, the better positioned you will be to protect your family.

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